Alucoque a by-product from the aluminium manufacture as mineralizer in the clinker production.

TIRONI, ALEJANDRA; CASTELLANO, CLAUDIA CRISTINA; RAHHAL, VIVIANA FÁTIMA; MOCCIARO, ANABELA; BONAVETTI, VIVIANA; SCIAN, ALBERTO N.; IRASSAR, EDGARDO FABIAN; MOYAS, ERNESTO DARIO; TREZZA, MÓNICA ADRIANA

Praga

Congreso; 15 th International Congress on the Chemistry of Cement Prague; 2019

Research Institute of Binding Materials Prague and the Czech Cement Association

The use of mineralizers in the clinkerproduction facilitates the clinkerization process, decreases the liquid phasetemperature and mineral eutectic melt and consequently saves energy. Calciumfluoride is commonly used as mineralizer in the manufacturing of Portlandcement clinker, but by-products with fluorides could also, be valorized asmineralizers (Menéndez et al. 2015). Due to its mineralizing characteristics,fluorine favours the thermodynamic stability of C3S with regard to C2Sallowing the C3S formation at temperatures lower than 1250 °C (Blanco-Varelaet al. 1995). Alite is a solid solution of C3Swith few percentage of impurities. It constitutes the major phase of anhydrousPortland cement. In industrial clinkers, alite crystallises into two monoclinicforms designated M1 and M3, both polymorphs are mostly stabilised at roomtemperature by the presence of sulphate or magnesium impurities (Maki &Goto 1982, Courtial et al. 2003).The aim of this work is to study theviability of using spent potlining (SPL-alucoque) from the aluminiummanufacture in Argentine as mineralizer in the clinker production. Analysis ofthe Portland cement clinker phases obtained, specially C3Spolymorphs, and their influence in the cement hydration phases, and compressivestrength developed by mortars were studied in this work. Alucoque containscarbon, cyanides and fluorides minerals from the electrolytic tanks, andcurrently it is stored as a waste.